Alarm for eight-day clocks



' P. .G. LESSMANN.

ALARM FOR EIGHT DAY CLOCKS- urucmou man NOV. 29. 1918.

'1 ,333:,.178. Patented Mar. 9, 1920.

314 uemtoz,

Pal/Z G. lawman,

I UNITED warns-PA N onn on.

PAUL e. LnssMAnn, or-oIIIoAeo, IIJLINoIs.

ALARM on EIGET-DAY oLooKs;

Application filed November 29,1918. Serial n eeasw. I

nism utilizing an electrically operable alarm, for instance a bell, for which the electric circuit is closed by means associated with the hour hand operating means of the clock and to provide the particular form of circuit establishing means as well as the other details of construction shown in the accompanying drawings and hereinafter described and claimed.

In the said drawings Figure 1 is a front elevation of the parts of my attachment which are disposed within the clock casing;

Fig. 2 is a side elevation of the parts of Fig. 1, together with a portion of the back of the clock; V

F ig. 3 is a fragmentary rear View of a clock utilizing my improvements;

V Fig. 4 is a diagrammatic view of the electric circuit means employed;

Fig. 5 is a vertical sectional view through the plunger contact device employed;

Fig. 6 is a vertical sectional view through the other contact device employed, and

Fig. T-isa vertical sectional, view on the line 77 of Fig. 6.

In considering the drawings, .it is to be understood that most of the'parts of'the clock have been omitted, since they form no part of the invention and would only tend to obscure the disclosure. The parts of the clock therefore which are shown, are to be taken as diagrammatic, and given only for an understanding of the invention.

The alarm emplpyed may be any suitable type of bell as suggested at 8, and which may be mounted on' o'ne side of the clock frame as at 9, and in the rear of one of the facing strips as at 10, as shown in Fig. 3.

The electric battery employed is designated 11, preferably resting on the support 12 for the clock, and beneath the base wall 13 of Specification of Letters Patent.

Patented Mar. 9,

theclock casing, surrounded by the riser walls 1-1 of said casing. IA conductor wire 15 leads from'one pole of'the battery 11 to a" plunger contactdevice A which cooperates with a contact device Bjto establish the electric circuit. 1 The circuit is c0m-' pletedby a conductorforme'd in a section 16 which leads from the contact device B to the bell 8 and by a section 17 which leads from the bell 8 to the other poleof the battery 11. In the section 17, a suitable switch 18 may be provided. As seen in Fig, 3 the switch 18 may be mounted on one of the risers 14. 1

Contact device A comprises a suitably shaped stud 19 having a bore 20 provided with screw threads therein in order to receive the shank of a set screw 21 which passes through the back of the clock 22, in Fig. 2, and engages the screw threads in the opening 20. The stud 19 is thus secured place and preferably at the angle shown in Fig. 1. Ifdesired, washers or disks 23 maybe placed against the opposed the stud 19 is a plunger contact 24. This contact shdes 1n an enlarged diametricopening 25 of the stud being guided by plugs 26 and 27 soldered'or otherwise rigidly fastened to the stud within the opening faces of the back of the clock as shown Secured to the contact 24and slid-able there:

with, isa disk or projection 28. Surround: ing the contact within the opening 25 is an expansive coil spring 29, one end'of whizh engages the disk '26 while the other end engages the projection 28. I The spring 29 normally urges the projection 28 into contact with the projections 27, and the sliding contact 24 into projected position as shown in Figs. 1, 2 and 5.

'Said contact 24 has a link 30 loosely connected thereto by means 'of. an eyelet31. This link30 1n turn 'ispivoted or loosely connected to a lever 32, as at 33. This lever, at oneend, 1s plvotedas at81, to the frame 35" of'the clock works, and whi b has been butfragmentarily shown." Lever 32 rests on a cam 36 and is adapted to be permitted to be moved by said'cam from the dotted line position of Fig. 1, where the contact 24 1s retracted to the full line position of Fig. 1, I

where the contact 21 is projected. Cam 36,

' means of the link 80;

ismounted to turn with a spindle 87, which.

is suitably driven to turn the hourhand of the clock, which is mounted thereon, an illustration ofwhich has been omitted for the sake of clearness. It will be seen therefore that as the spindle 87 turns the (RH! 36 will turn to vary the position of the lever 82,

V sleeve 4-0. This device 8639-l0 merely frictionallyjengr ges the spindle 87. T he degree of fri tion however is sutlicient that the spindle 87 will move the device therewith but that. the device may be turned independently of the spindle 87, withoutdisturbing its position or the position of the hour hand moved thereby. 1 V V V The contact device B comprises a stud 41 having an opening 4L2 provided with screw threads therein with which engage the screw 7 threads of theshank of a set screwe8, passing through the back 22 of the clock. VVashers or disks 44 may be placed against the op- .positefaces of the back 22 as shown in Fig. '2, and the conductor 16, maybe fastened in .place or clamped beneath the head of the set screw 43. Stud ail-mounts a contact 4-5, with Y which the contact A l engages to establish theelectric circuit. Since the distances 'between the studs 19 and 41 may vary in attaching the deviceto clocks, contact 45 is preferably adjustable relative to the contact 2%. To this end contact 45 slides in a diametric opening 46' of the stud 41, being clamped in the desired adjusted position by means'of a set screw 48 carried by the stud. To facilitate engagement of the contact 2% with-the contact 45, the last mentioned contact is preferably dished or concaved' as at e7.

It will be understood that the parts of the devices. A andB should be of conducting material, in order to establish the electric circuit. Also that whileboth ot these devices are shown at an angle, as in Fig. 1, this is done merely to accommodate attachment to one style of clock and hence no limitation is to be inferred.

In operation, the dial 89 isturned relative to the spindle 37, so that the lever 82 willjbe pulled downwardly by the spring 29, off of the lobe or highest point of the cam, to the lowest point. ofthe cam when the or thereafter, switch 18 is closed.

It may be mentioned,

alarm is to be given. When the lever makes the fall referred to, spring 29 bybearing against the projection 28 will urge the contact 24 into abutting Orstriking relation with tzhecontact 45, thus closing the electric circuit through the bell 8, causing it to ring to give the alarm. It will be understood of course that before setting the dial 39 After the alarm is given, it will continue, until the switch, 18 is-manually opened. Thereafter the dial 89 maybe reset as will be clearly understood. i

Since merely one preferred embodiment of the invention has been illustrated and described, itis to be understood that changes in the details of construction thereof maybe made within its spirit and scope,-

I claim: .V

1. An alarm mechanism f of the class described having electric circuit means including contacts and an, alarm, a stud movably mounting one of'said contacts, means to move the contact, and a spring bearing against the stud and against the contact.

,2. An alarm mechanism of the class described having electric circuit means including contacts and an alarm, one of the contacts being movablerelatively to the other contact to control the givingof'the alarm, a stud mounting one of the contacts, said stud being turnable relatively to the other contact, and means to secure said stud to a support. V j

' 8. An alarm mechanism of the class described including a lever, acam which said lever follows, a link device, a contact connected to said link device, a stud, means to fasten the stud to a support and for axial adjustment, said stud having an opening in which the contact slides, abutment members adjacent the ends of said opening, abutment means on the contact to engage the lowermost abutment member, a spring surrounding the contact and engaging the upperi'nost abutment member and theabut-ment means of the contact, a second contact, said second contact being engageable by the first contact to give the alarm, a stud, means to fasten the stud to a support and for axial adjustment, and'mcansto adjustably fasten the second mentioned contact to the section'mentioned stud, whereby its position may be varied relative to the movable contact.

7 In testimony whereof Ihave aflixed my signature in. the presence of two witnesses. 

